Cannot Tune Beds after motherboard change

Skan

Hello,
I have a 15mm thick aluminum bed running two heaters, it was a slow process heating up prior.
But always hit temp. 85Degress C
I recently changed the stepper drivers and motherboard out as the other ones faulted.
The bed was still operational though.
Motherboard is and was Duet Mini 5+ with WIFI like for like replacement
RRF 3.2 to RRF3.4

Since the change it fixed my initial issue of the extruders not working, but now the beds wont heat up.
I get a message
"Error: Heater 0 fault: temperature rising too slowly: expected 0.12°C/sec measured 0.01°C/sec"
When I try and tune the beds independently I also get a fault
"Auto tune cancelled because target temperature was not reached" so I lowered the setpoint (50degrees) and tried the tune again.
Where I get
"Warning: Auto tune of heater 3 failed due to bad curve fit (R=0.251 K=3.910:0.000 D=3.42)"

The g.code is as follows

M950 H0 C"out1" T0 ; create bed heater output on out0 and map it to sensor 0
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 P0 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C

M950 H3 C"out2" T3 ; create bed heater output on out0 and map it to sensor 0
M308 S3 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 3 as thermistor on pin temp0
M307 H3 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 P1 H3 ; map heated bed to heater 0
M143 H3 S120 ; set temperature limit for heater 0 to 120C

Override is
M307 H0 R1.000 K0.543:0.000 D90.00 E1.00 S1.00 B0
M307 H1 R2.819 K0.612:0.000 D9.21 E1.00 S1.00 B0 V23.0
M307 H2 R2.834 K0.360:0.000 D5.51 E1.00 S1.00 B0 V23.2
M307 H3 R1.000 K0.543:0.000 D90.00 E1.00 S1.00 B0

So last error I got was the bad curve fit and im stuck on what to do next.
It is winter here, if that makes a difference. Chamber is around 10-12 degrees when cold.
Thankyou

Phaedrux

15mm thick?! wow. What size? How powerful is the heater? Where is the thermistor located. Do the bed temp sensors actually register a temperature change?

Skan

@Phaedrux Hi there, I have resolved the issue, the printer is 1mx1mx1m, we make custom car parts. Unfortunetly technical support for the printer is not available . I had to heat up the beds initially and run the Macros to clear faults, then ran both simultaneously.